Orthogonal mask



FIG. 1 is a front perspective view of an orthogonal mask showing my newdesign;

FIG. 2 is a front view thereof;

FIG. 3 is a left view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a back view thereof.

CLAIM The ornamental design for an orthogonal mask, as shown anddescribed.